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Freestanding Graphene Paper Supported Three-Dimensional Porous Graphene–Polyaniline Nanocomposite Synthesized by Inkjet Printing and in Flexible All-Solid-State Supercapacitor

Chi, Kai, Zhang, Zheye, Xi, Jiangbo, Huang, Yongan, Xiao, Fei, Wang, Shuai, Liu, Yunqi
ACS Applied Materials & Interfaces 2014 v.6 no.18 pp. 16312-16319
capacitance, electrical conductivity, electrochemistry, electrodes, electrolytes, energy, energy density, graphene, hydrogels, nanocomposites, paper
Freestanding paper-like electrode materials have trigged significant research interest for their practical application in flexible and lightweight energy storage devices. In this work, we reported a new type of flexible nanohybrid paper electrode based on full inkjet printing synthesis of a freestanding graphene paper (GP) supported three-dimensional (3D) porous graphene hydrogel (GH)–polyaniline (PANI) nanocomposite, and explored its practical application in flexible all-solid-state supercapacitor (SC). The utilization of 3D porous GH scaffold to load nanostructured PANI dramatically enhances the electrical conductivity, the specific capacitance and the cycle stability of the GH–PANI nanocomposite. Additionally, GP can intimately interact with GH–PANI through π–π stacking to form a unique freestanding GP supported GH–PANI nanocomposite (GH–PANI/GP) with distinguishing mechanical, electrochemical and capacitive properties. These exceptional attributes, coupled with the merits of full inkjet printing strategy, lead to the formation of a high-performance binder-free paper electrode for flexible and lightweight SC application. The flexible all-solid-state symmetric SC based on GH–PANI/GP electrode and gel electrolyte exhibits remarkable mechanical flexibility, high cycling performance and acceptable energy density of 24.02 Wh kg–¹ at a power density of 400.33 W kg–¹. More importantly, the proposed simple and scale-up full inkjet printing procedure for the preparation of freestanding GP supported 3D porous GH-PANI nanocomposite is a modular approach to fabricate other graphene-based nanohybrid papers with tailorable properties and optimal components.